After downloading the WordPress Product Catalog ZIP file
1. Login to your WordPress site administrator panel and head over the 'Plugins' menu
2. Click 'Add New'
3. Choose the 'Upload' option
4. Click Choose file (Browse) and select the Spider Catalog zip file.For Mac UsersGo to your Downloads folder and locate the folder with the gallery plugin. Right-click on the folder and select Compress. Now you have a newly created .zip file which can be installed as described here.
5. Click Install Now button.
6. Once it is complete, activate the plugin.